Magnetic Behavior of 1D Helicoidal Chains in Ba₇CuFe₆F₃₄ a New Kind of Ferrimagnetic 1d System

Abstract

One way of obtaining new low-dimensional magnets is to study pseudo-binary diagrams, in which one limit corresponds to a 1d magnet and the other one to a 2d compound. We previously developed this method and chose the system BaFe₅ (1d) — BaCuF₄ (2d) which gathers S = 5/2 and S = 1/2 spins, of special interest for magnetic investigations. In this system appears a new phase, Ba₇CuFe₆F₃₄ (1), whose structure was recently solved (2); its description in terms of isolated complex chains corresponds to the first part of this paper; the second part will deal with magnetic properties and, finally, the corresponding Mössbauer data will be given in the last section.